| 1.2.1998 | 24 h Daytona | 07 | 993 | Cobb / Marshall / Chambers / Gallade / Konig | G & W Motorsports, Inc. | 18th |
| 1.2.1998 | 24 h Daytona | 15 | 993 | Cochran / Aouate | Kevin Jeannette | DNS |
| 1.2.1998 | 24 h Daytona | 23 | 993 Carrera RSR | Conte / Lambert / Holt / Havens | Alex Job Racing/Team Seattle | 7th |
| 1.2.1998 | 24 h Daytona | 37 | 968 GTR | White / Loftis / Strange / Howe | GTR Motorsports | 62nd |
| 1.2.1998 | 24 h Daytona | 38 | 911 GT1 Evo | Boutsen / Pilgrim / Kelleners | Champion Motors | 19th |
| 1.2.1998 | 24 h Daytona | 44 | 911 | Grohs | GLPK Racing Leaders | 73rd |
| 1.2.1998 | 24 h Daytona | 45 | 993 GT2 | Cohen / Kumpen / Schoonbroodt / Funke | GLPK Racing Leaders | 59th |
| 1.2.1998 | 24 h Daytona | 50 | 911 Turbo | Johnson / McGlynn / Oppenheimer / Balbach / Johnson | Johnson Autosport Racing | 53rd |
| 1.2.1998 | 24 h Daytona | 52 | 911 Carrera RSR | Russell / Stitt / Hillstead / Arnold / Crilly | Team Protosport GT | 46th |
| 1.2.1998 | 24 h Daytona | 55 | 911 Carrera RSR | Slater / Ralston / Peterson / Trejos | AASCO Performance | 9th |
| 1.2.1998 | 24 h Daytona | 66 | 911 Carrera RSR | | Potolicchio | DNA |
| 1.2.1998 | 24 h Daytona | 67 | 993 Carrera RSR | Ronson / Pelke / Pelke / Busby | The Racers Group | 23rd |
| 1.2.1998 | 24 h Daytona | 68 | 993 Carrera RSR | Buckler / Collin / Bretzel / Dayton | The Racers Group | 64th |
| 1.2.1998 | 24 h Daytona | 69 | 993 GT2 | Lay / Ruch / Langhorne / Ried | Proton Competition | 29th |
| 1.2.1998 | 24 h Daytona | 73 | 993 Carrera RSR | Lewis / Burgess / Lazzaro / Mathewson | Jack Lewis Enterprises | 10th |
| 1.2.1998 | 24 h Daytona | 75 | 993 Carrera RSR | Schmidt / Bingham / Smith / Harrington | On the Edge Racing | 65th |
| 1.2.1998 | 24 h Daytona | 76 | 993 Carrera RSR | Doolin / Peeler / Ruther / Snow | Team A.R.E. | 63rd |
| 1.2.1998 | 24 h Daytona | 86 | 993 Carrera RSR | Redman / Marshall / Urciuoli / Amren / Cobb | G & W Motorsports, Inc. | 52nd |
| 1.2.1998 | 24 h Daytona | 90 | 993 GT2 | Wauters / Wauters / La Rosa / Longin / Vanierschot | AD Sport | 60th |
| 1.2.1998 | 24 h Daytona | 96 | 993 | Zitza / Wheeler / Davies | Olive Garden Racing | 43rd |
| 1.2.1998 | 24 h Daytona | 97 | 993 GT2 R | Seiler / Rössler / Kitchak / Zadra / Konrad | Konrad Motorsport | 4th |
| 1.2.1998 | 24 h Daytona | 98 | 993 GT2 | Schumacher / Nearn / Konrad / Ham | Konrad Motorsport | 54th |
| 21.3.1998 | 300 km Suzuka | 9 | 993 Carrera RSR 3.8 | Hioki / Sasaki | Team Daikokuya | 27th |
| 21.3.1998 | 300 km Suzuka | 10 | 993 GT2 | Asou / Ishikawa | Ability | 25th |
| 21.3.1998 | 300 km Suzuka | 30 | 993 GT2 | Yamada / Okada | Team Take One | 20th |
| 21.3.1998 | 300 km Suzuka | 51 | 993 Carrera RSR 3.8 | Iketani / Sodeyama | Cobra Racing Team | 11th |
| 21.3.1998 | 300 km Suzuka | 70 | 993 GT2 | Ishibashi / van Schoote | Team Gaikokuya | 22nd |
| 21.3.1998 | 300 km Suzuka | 71 | 993 GT2 | Hoshino / Jounai | Sigmatech Racing Team | DNF |
| 21.3.1998 | 300 km Suzuka | 910 | 993 Carrera RSR 3.8 | Sunako / Yogo | 910 Racing | 14th |
| 21.3.1998 | 300 km Suzuka | 911 | 993 Carrera RSR 3.8 | Takahashi / Kobayashi | 910 Racing | 21st |
| 22.3.1998 | 12 h Sebring | 01 | 993 GT2 R | Tremblay / Snow / Rohr | Rohr | 33rd |
| 22.3.1998 | 12 h Sebring | 01A | 911 GT1 | | Rohr | DNE |
| 22.3.1998 | 12 h Sebring | 04 | 993 GT2 R | Morton / Graham / Fellows | C. J. Motorsports | 9th |
| 22.3.1998 | 12 h Sebring | 07 | 993 | Marshall / Marshall / Huisman / Law | G & W Motorsports | 15th |
| 22.3.1998 | 4 h Jarama | 5 | 993 GT2 Evo | Saldaña / de Orleans | Kremer Racing | 6th |
| 22.3.1998 | 12 h Sebring | 23 | 993 Carrera RSR | Slater / Wagner / Havens | Alex Job Racing | 14th |
| 22.3.1998 | 12 h Sebring | 24 | 911 Carrera RSR | Refenning / Vargo / Vargo / Refenning | Tim Vargo | 18th |
| 22.3.1998 | 12 h Sebring | 25 | 911 Carrera RSR | Slater / Kitch / Cilli / White / Petersen | Alex Job Racing | 19th |
| 22.3.1998 | 4 h Jarama | 29 | 993 GT2 R | Monteiro / Monteiro | Estoril Racing Team | 2nd |
| 22.3.1998 | 4 h Jarama | 32 | 993 GT2 | Pagotto / Giribaldi | GT Racing Team | DNA |
| 22.3.1998 | 4 h Jarama | 33 | 993 GT2 | Kumpen / Cohen / Margueron | PK Racing | 4th |
| 22.3.1998 | 4 h Jarama | 34 | 993 GT2 R | Pareja / Chéreau / Leconte | Chereau Sports | 3rd |
| 22.3.1998 | 4 h Jarama | 35 | 993 GT2 | Giacomelli / Kaufmann | Freisinger Motorsport | DNS |
| 22.3.1998 | 4 h Jarama | 38 | 993 Cup | Blieninger / Riccitelli | RWS Brun Motorsport | 5th |
| 22.3.1998 | 12 h Sebring | 46 | 911 Carrera RSR | Schmidt / Bingham | Bill Radar | 23rd |
| 22.3.1998 | 4 h Jarama | 52 | 911 Carrera RSR 3.8 | Touroul / Ricci / Ortion | Raymond Touroul | DNS |
| 22.3.1998 | 4 h Jarama | 53 | 993 Cup | Blieninger / Riccitelli | RWS Brun Motorsport | DNA |
| 22.3.1998 | 4 h Jarama | 54 | 993 Cup | Guillot / Albouy / Thomas | Pilotage Passion | DNS |
| 22.3.1998 | 4 h Jarama | 55 | 993 Cup | Bajo / Bajo / Bilardo | Eco Tec | 10th |
| 22.3.1998 | 12 h Sebring | 55 | 911 Carrera RSR | Ralston / Collins / Trejos | AASCO Performance | 29th |
| 22.3.1998 | 4 h Jarama | 57 | 993 Cup | Perrier / Richard | Thierry Perrier | 9th |
| 22.3.1998 | 12 h Sebring | 58 | 944 Turbo | Mazzuoccola / Wolkoff / Raccaro / Fillipakis | Al Broadfoot | unused |
| 22.3.1998 | 12 h Sebring | 66 | 993 GT2 | Ham / Konrad | Konrad Racing | 5th |
| 22.3.1998 | 12 h Sebring | 67 | 993 Carrera RSR | Baron | The Racers Group | 43rd |
| 22.3.1998 | 12 h Sebring | 68 | 993 Carrera RSR | Earle / Collin / Buckler | The Racers Group | 27th |
| 22.3.1998 | 12 h Sebring | 69 | 993 Carrera Turbo | Spreng | Gustl Spreng | 46th |
| 22.3.1998 | 12 h Sebring | 71 | 993 GT2 Evo | Pilla / Kimbrough / Kitchak | Art Pilla | 22nd |
| 22.3.1998 | 12 h Sebring | 74 | 911 GT1 Evo | Boutsen / Wollek / Pilgrim | Champion Motors | 3rd |
| 22.3.1998 | 12 h Sebring | 76 | 993 Carrera RSR | Ruther / Vargo / Anegelos / Argetsinger | Team A.R.E. | 16th |
| 22.3.1998 | 12 h Sebring | 77 | 993 GT2 R | Rössler / Kitchak / Turner | Konrad Motorsport | 31st |
| 22.3.1998 | 4 h Jarama | 77 | 968 | Leyrana / Mothe | Igancio Leyrana | DNF |
| 22.3.1998 | 4 h Jarama | 78 | 968 | Gonzales / Gacia | Manuel Gonzales | 12th |
| 22.3.1998 | 4 h Jarama | 79 | 911 | Fernandez Davila / Reis | Eduardo Davila | DNF |
| 22.3.1998 | 4 h Jarama | 80 | 968 | Martín Cantero / Ligonnet | Santiago Martin Cantero | DNF |
| 22.3.1998 | 4 h Jarama | 81 | 968 | Rosado Dominguez / Ligonnet | Manuel Rosado | DNF |
| 22.3.1998 | 12 h Sebring | 86 | 993 | Law / Pfeffer | First Union | 42nd |
| 22.3.1998 | 12 h Sebring | 96 | 993 | Wheeler / Davies / Zitza | Olive Garden Racing | 21st |
| 22.3.1998 | 12 h Sebring | 99 | 993 GT2 | Nearn / O'Steen / Schumacher | Larry Schumacher | 10th |
| 23.3.1998 | Test Silverstone | 38 | 911 Carrera RSR | Barrett / Lockie | | 18th |
| 23.3.1998 | Test Silverstone | 46 | 964 Carrera RSR 3.8 | Lucas / Osborne | PK Sport | 21st |
| 23.3.1998 | Test Silverstone | | 911 GT1 | Greasley / Wallinder | Blue Coral | 3rd |
| 23.3.1998 | Test Silverstone | | 911 Turbo | Wellings / Guest | | 22nd |
| 23.3.1998 | Test Silverstone | | 911 GT1 | Morelli / Goode | Millenium | 6th |
| 23.3.1998 | Test Silverstone | | 993 GT2 R | Lister / Morrison | Blue Coral | 10th |
| 23.3.1998 | Test Silverstone | | 993 GT1 | Masarati / Mortimer | | 17th |
| 23.3.1998 | Test Silverstone | | 993 GT2 R | Saunders / Saunders | Parr Motorsport | 13th |
| 23.3.1998 | Test Silverstone | | 993 GT2 R | Day / Astley | PK Sport | 12th |
| 23.3.1998 | Test Silverstone | | 993 GT2 | Konig / Chambers | | 15th |
| 29.3.1998 | 1000 km Monza | 9 | 911 Turbo | Ploeg / Bleekemolen / Papenburg | Bert Ploeg | DNF |
| 29.3.1998 | 1000 km Monza | 12 | 993 GT2 | Grassi / Colombo / Muenz | Rugerro Grassi | DNF |
| 29.3.1998 | 1000 km Monza | 14 | 993 GT2 | Frigerio / Babini / Sabatini | Massimo Frigerio | 5th |
| 29.3.1998 | 1000 km Monza | 15 | 993 GT2 R | Smith / Palmberger / Quargentan | Seikel Motorsport | 9th |
| 29.3.1998 | 1000 km Monza | 19 | 911 | Ried / Felbermayr, Sr. / Felbermayr, Jr. | Proton Competition | DNF |
| 29.3.1998 | 1000 km Monza | 21 | 993 GT2 | Mastropietro / Polli / Mastropietro | Promosport | 3rd |
| 29.3.1998 | 1000 km Monza | 22 | 993 GT2 R | Sangiuolo / Lusuardi / De Iturbe | RWS-Brun Motorsport | 4th |
| 29.3.1998 | 1000 km Monza | 23 | 993 Carrera RSR 3.8 | Hofer / Blieninger / Riccitelli | RWS-Brun Motorsport | 12th |
| 29.3.1998 | 1000 km Monza | 24 | 964 Carrera RSR 3.8 | Cassina / Michelotti / Bocciardi | Matteo Cassina | DNF |
| 29.3.1998 | 1000 km Monza | 25 | 964 Carrera RSR 3.8 | Haupt / Merzatico / Cattaneo / Gottifredi | Claudio Haupt | 11th |
| 29.3.1998 | 1000 km Monza | 26 | 993 Cup | Cerati / Sala / Simoncini | M.A.C. Racing | 10th |
| 29.3.1998 | 1000 km Monza | 27 | 964 Carrera RS | Tapparo / Padovani / Virdis | M.A.C. Racing | DNF |
| 29.3.1998 | 1000 km Monza | 29 | 911 Carrera Cup | Cattaneo / De Castro / Corongi | Win Sport Srl | 8th |
| 29.3.1998 | 1000 km Monza | 32 | 911 Carrera RS | Viganó / Rosa | Giovanni Viganó | 15th |
| 5.4.1998 | British GT Silverstone | 0 | 911 GT1 | Greasley / Wallinder | Blue Coral/Slick 50/Quaker State | 1st |
| 5.4.1998 | British GT Silverstone | 9 | 993 GT1 | Masarati / Mortimer | RMA Driving Sensations | 14th |
| 5.4.1998 | British GT Silverstone | 11 | 911 GT1 | Nielsen / Thyrring | Millennium Motorsport | 5th |
| 5.4.1998 | British GT Silverstone | 38 | 911 Carrera RSR | Lockie / Barrett | Premium Team - Carmichaels Motorsport | DNF |
| 5.4.1998 | British GT Silverstone | 40 | 993 GT2 R | Astley / Day | PK Sport | 10th |
| 5.4.1998 | British GT Silverstone | 46 | 964 Carrera RSR 3.8 | Lucas / Osborne | PK Sport | DNF |
| 5.4.1998 | British GT Silverstone | 50 | 993 GT2 R | Morrison / Lister | Blue Coral/Slick 50/Quaker State | 9th |
| 5.4.1998 | British GT Silverstone | 58 | 911 Turbo | Wellings / Guest | Wellings/Guest | DNF |